The　article　studies　the　methods　of　processing　bus　real-time　information　(GPS　data)　and　calculating　the　temporal　indexes　for　decision　making　in　bus　dispatching.　The　kalman　filter　algorithm　is　used　to　predict　the　bus　arrival　time.　The　result　shows　the　prediction　error　is　within　1.3　minutes　and　the　precision　is　71%　by　calculating　the　real-time　information　of　Beijing　bus　intelligent　transportation　system.